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Calculate the oxidation number of the element in the case Mn in KMnO4

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Calculate the oxidation number of the element in the case

Mn in KMnO4

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KMnO4 : 1(+1) + (oxidation no. of Mn) + 4(-2) = 0 

+1 + (oxidation no. of Mn) – 8 = 0

∴ oxidation no. of Mn = +7

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